Rebrand: polkadot → pezkuwi build fixes

- Fixed TypeScript type assertion issues
- Updated imports from api-augment/substrate to api-augment/bizinikiwi
- Fixed imgConvert.mjs header and imports
- Added @ts-expect-error for runtime-converted types
- Fixed all @polkadot copyright headers to @pezkuwi

backend/package.json

@@ -10,8 +10,8 @@
     "lint": "eslint 'src/**/*.js' --fix"
   },
   "dependencies": {
-    "@polkadot/keyring": "^12.5.1",
-    "@polkadot/util-crypto": "^12.5.1",
+    "@pezkuwi/keyring": "^12.5.1",
+    "@pezkuwi/util-crypto": "^12.5.1",
     "@supabase/supabase-js": "^2.83.0",
     "cors": "^2.8.5",
     "dotenv": "^16.3.1",
@@ -21,7 +21,7 @@
     "pino-pretty": "^13.1.2"
   },
   "devDependencies": {
-    "@polkadot/api": "^16.5.2",
+    "@pezkuwi/api": "^16.5.2",
     "eslint": "^8.57.1",
     "eslint-config-standard": "^17.1.0",
     "eslint-plugin-import": "^2.32.0",